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Forming Principle and Characteristics of GAIM and WAIM for Gas-assisted Injection Molding
- Dec 17, 2018 -

Gas-assisted Injection Molding (GAIM)

Forming principle:

Gas-assisted moulding (GAIM) is a new injection moulding technology that injects high-pressure inert gas when the plastic fills the cavity properly (90%~99%). Gas drives melt plastic to continue filling the cavity and replaces the plastic holding process with gas holding.


Reducing residual stress and warpage;

Elimination of depression marks;

Reduce clamping force;

Reduce the length of the runner;

Save material;

Shorten production cycle time;

Extend die life;

Reduce the mechanical loss of injection moulding machine;

It is applied to finished products with great thickness variation.

GAIM can be used to produce tubular and rod products, plate products and complex products with uneven thickness.

Water-assisted Injection Molding (WAIM)

Forming principle:

Water-assisted injection moulding (WAIM) is an assistant injection moulding technology developed on the basis of GAIM. Its principle and process are similar to GAIM. WAIM uses water instead of GAIM N2 as a medium for evacuation, penetration and pressure transfer.

Characteristics: Compared with GAIM, WAIM has many advantages.

The heat conductivity and heat capacity of water are much larger than those of N2, so the cooling time of products is short and the forming period can be shortened.

Water is cheaper and recyclable than N2.

Water is incompressible, and finger effect is not easy to occur, and the wall thickness of products is more uniform.

Gas is easy to penetrate or dissolve into the melt, which roughens the inner wall of the product, and produces bubbles on the inner wall, while water is not easy to penetrate or dissolve into the melt, so the product with smooth inner wall can be made.